1。I have already learned that passage by heart,and now I am reciting it (that passage)。2。I have learned the know-how of driving a car。 I am learning how to drive a car。3。I am teaching the chidren to draw 。4。The chidren taught by me can draw some pictures now。(I have taught the chidren how to draw pictures。)5。Should I fectch something for you ( when I come back)?6。What else (food )are there besides the cake?7。Except Tom who else will not go? 至于用“has taught ”还是用 “had taught”取决于所描述事情的时态,在 4。中我是用 “ have taught”来说近日的事,当然我也可以用“had taught”来说过去的事。